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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf704b4b72923d0bb2098d9e1a7b979be71c8cea6651bd1cf3b61c13d5a08f7' 
  AND token = 'CAqHVQkyArT0VN1UHkuhFbjFf/niB1IHxdve4Ol1l5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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