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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5b3afa35112524e020e5b569e5348a098c4b69d392eea0ac5c86f79f3dfccf' 
  AND token = 'fo/VTEzDaPLgUwp7Vs4pKHHcrAzI9FFKooT1zh37KgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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