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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4f884684b6cc02b2a3e3e80798a02a393267f59354ea1d2b1f5c9d4580b08e' 
  AND token = 'C9DfGHD6mVKdyrxH/czZn91pCG6ssIetn6ahCK/2mj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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