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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e328b68d38d365e367562bbdeeaa44acee41ba756144ad652c244abea4e5af3' 
  AND token = 'XyhNP80ZkHR5lWYThi6LPX4S2J0Uk/TfA3r0swT+zV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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