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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffbfb014123426a92b3871f096241a7174c852e13890d26a2f543fd5366f92d' 
  AND token = 'b6Xi2hUv6smrgqxdHMLpudFs8gyDTDlsbT33akF2l5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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