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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5191c2d8fb7bcc47de60f6e3b4a16087e5e3f8be08afb6d5abe7a14dfa81963a' 
  AND token = 'oGB4uYMsDm6VUmUL1GGE/Xn1o5WwRo9LKpyrikmJiEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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