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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2a092c79f69ec8d70a46165776c57351bfae51e77dd9c3010a34fc88e241b3' 
  AND token = 'Sp2LhJWGCbP2DocKZZKlT1Ei41B9YW7DdEfzKMoMTZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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