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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a7e8595f4c10a49241bba0c6d4d35aafd3c0ec548e1da2b15e66720a7bb8fc' 
  AND token = 'JHhaVmgniRXXYuNnhI4E+BdLacHWXGAlKddrYiQeonU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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