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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589ada85746a5ae117336e83732b8c7161a13aedb6eddb6301d09e8e102c64b4' 
  AND token = 'iX42oSo5caLS0gBUeMSlxQzRfs99Jmuwrsyxgh+yiGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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