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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa4684088550d01693ff0f5f793d3a56b8fd907ad45dc5ce0cb6b77848ca2ae' 
  AND token = 'c3Nr2Al1A7x6CjGWXDhdkGJIXwQiHaza5BD1tShl5N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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