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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd69a5cc35bdae979bd0f3330dd5da0cf055212f7767415443c99d0300af18d' 
  AND token = 'Ju+7unxijiyN3E+jCsmwc+Tsow4rqPw4I84MlJWvx9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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