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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f96b16d892b6e3411f3b6bc758493a3795a31a822f277d592366c28e88d1f2d' 
  AND token = 'i8nLFLXc3uN3rvxSlMs9ublV6CfiQZeJXsko2qMYve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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