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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a184ac5699f1faab15738d4b51660f9735dc8d91129f9361c6a831bc7d3bdeb6' 
  AND token = 'RCieBjc6TvAZSXU9wIbyXK9ne2fxqjGrjmEZlWfXOwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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