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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cfb3bcb8be55cfa0782e310fed96989955db037244e8ed2a952cca0a6a812d' 
  AND token = 'CdZ4diccSpTN8M0eZQGohVoQpsinMXnkBIXZvl2qOMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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