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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbcac5d2d656d3044544abda872fac121f2e90cb0ae2c4507f40616f550125a' 
  AND token = 'yi9egIuodQzWqjVgS7lmLewCzUJ4YuWkkYfF44SI90M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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