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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd812a96cd0a1efd82bad420fbf15f5e757e596918cbfbab05a5464e55cc78018' 
  AND token = '8ZszlrTt1mlMGNJV/vjjNYe7YsR+9qe8HNjam/KCb5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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