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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d91979e7dcdacc7181fb8b400dc7c774fcea0ec82de89c16e254a6914052bbf' 
  AND token = 'DahMzb9kyBg/xHf2mXDgD1i2HExDwurxX6PGVke0NBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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