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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89549517375479e26af0e7e2d37e36fe9b60e73c0407704fb4199660de1d63eb' 
  AND token = '14re5BjQzucovVuM8e8TriSbfpaBfmcP6nNCbstCbb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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