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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e578682a90e3d7ada30ddadaeba7eba3331dedafc352a67377a1c0fbea9623' 
  AND token = 'oNYgqhyaoxLd5PBnBheZ8Ou8hxcDDAe2O2u6u4mdhOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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