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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e181da7f05d132e9e6fdf40f08cc3db5fbbf48dfae7cf3f76b14cf5fa09338' 
  AND token = 'y9q4EsHC/R/Hq+2TPA6Dn/zXLMS+NETZCSM1BUPrMHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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