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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedb018f1fb0671fcd96a7a6320893638c21027885e16251285be6d702f86196' 
  AND token = '76zi0LbfVQgSK5cvs54xeWPCC8jJOreI/Pr1hIsAeBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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