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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d7aa6eb505e8d8412e900e702c675d01af47af5da1e05a8031ba7714fe0173' 
  AND token = '+Zcf7IFz9SweiroymuwaWrBs76eATHAR7Vd5ftohbdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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