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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b3105cc6985c3f6a2c52f1d83ac80aebf5749ff29c2e9d80e683156196ba76' 
  AND token = 'eooo1eRWC5z6sq8JGlF1bi0uEkP2GI9lf4mfAyFYGjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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