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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a96b4879b7e601c6828174a7f119863eb85ebec55d137d5f238f5105a92777' 
  AND token = 'N1nmfczWphU6XsqHXzwhc/C4MO8m2y6qB8SdKoFw+oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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