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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2057d8867db546b43331b2f8a5f14bbc33f6baa4f1f4f1481e0f5ee1277a3e' 
  AND token = 'yTlZyA/r6zS/6X7B6jzRdow4Pm/5kCWiPEF4DMfnuRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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