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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5000c8f538c7a070b7c649a1dd65c890c3cb3dcaf76d6485f272cc2833ccc4b8' 
  AND token = 'CvwjbCr56aYU98AC1LbvvDHs2kYtCifQAbVfEW/p4+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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