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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088ccd36bf4c5bc1b986231ac8ddae47009c988486c8e0a413d4bcde4ab0583b' 
  AND token = 'cJRKyaO9a5ovPYMaY7UtQ6ej1BFIjRrspcysyttKXHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}