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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131c47338b9f6dd7bb8d73bcbe2bb80f0f0b8d2866f3987d4d3271d8860e3d7f' 
  AND token = 'f8KoagEwXp2TxIzAjoSLNA1yzTol0jNU8ALLM7y7J6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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