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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ebe291b8b176604ecf5efada49fe1fc919cf1b242ca89c8b0fdc3b1fcda95b' 
  AND token = 'P+7c+d+Vn8B6LvsWHdwnxbS+Xzacs5hzff0c61Tsbp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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