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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5a83e5ac3b2a1365d2f7714b7d22b0e8db3cab0545e4e0a7df774752f4f71e' 
  AND token = 'cwqc8TgqtzAyw89p352eQKw21dJic6uRhgbi24BH/NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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