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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11dc57ef1dd7487ce801dbdea8b77dc09e60927c4f096b1afb683dd2b8875e8' 
  AND token = '5c9k5ni27kgu7DcpyW/gTsYac4Ghgmzi2uUb68SdNPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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