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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce73c8646e2bd507087fd75170559abd12eb23290bf1fda5c2e2079ed141af11' 
  AND token = 'faWxn+VR/0Ik2/4BqEDKP+nvDgUPUH0pau6CCZIacTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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