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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c62470d6dea7fd7c38dccaa6ea3f7a1b8629014b0fb3c68de7a3cd201aee7c' 
  AND token = 'wgr74OnbHLT7m/Y9QhmH1nTJtQYEuP7e+kZdKD9PyVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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