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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc684cfed423e27d50e616b81bcc2715c6c2502f5410f9fa24b0c840f4bd538c' 
  AND token = 'mm/GVWzmJSVHfoFTVaAs5rtytrvCjDgz88x9+TJx23w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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