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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf43f1ecf64e51945d989761f111aaed70549fde240efe5a8a581b62edf7e26' 
  AND token = 'qIYmKzKoegJI+4M2HPGg7RL7lDSjN9YHnGi7wno9nEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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