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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb962978d76523103f8cd14086ba7f9e7856035ca0c655ad4874826faba9f59' 
  AND token = 'uAe9JN0NPmla0kDkap9TuKKhZERtzRCF+TNNjJYOdE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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