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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c9807fb38599aa4e3a4fd37eee4c8b3884d4fbda4a2f3703a00c23c656a56c' 
  AND token = '9OduovOvvQK10afZIynZSn05LjqhiRCtUI2ylVEKKPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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