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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6393cb402ac0b457a7f438d829364a4c32f0ecf03ef07e72d7e6a57805ea5f2' 
  AND token = 'QQxwRyzQ2LFF4fvAI5GTLZM2Wi8n9VG8NiffRxVPHUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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