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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c433c26b985feffec4d6aa4a8e7493d4966c1e7174adb3841ce3cccd7a2525fe' 
  AND token = 'LpSGEPur/M6dp+tekzS2vocUGbw3DXCzvZwOxLZw1mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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