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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbe50f2810394afcb22a5070a09e1fc7d8ae9e49b7a6c6a05f5d23f57c25c1e' 
  AND token = 'VIpEJErXIf6Hve2+avkGT3Ov/bSUa4lvg0M3jr9uQdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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