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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad479ca60e8a70a60b10fa9db0badc91e3b61f9107b992759fba117a09f7362d' 
  AND token = 'kMFKNxAIr4ARCxkdvy9vl6GhWdN/v9YvVB+zysg4lLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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