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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b06d2a37545913ccf687337b3f9d0ab62aba3828f69c2175b42b13b8e5a0f9' 
  AND token = 'wNMK5rdDg29p+dtCY50u7x3ST33SL+DxZE0Xtzsu3D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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