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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e9cf2c2c2f8db21df5f3eda6fcf602e4577a168ce905a86f1e5aeeb44fdda5' 
  AND token = '0ulHSUjtrLKWrAIbKNLO+MCG73/BNfO/wu9dh8qbfSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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