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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e825e30923fe750b2cec9aa0fa80bcb1daaf0515be62f8abd4c1e13a6eb51099' 
  AND token = 'eYjPhQvvG371kOP0wXL22HDxd75SsWmJYgxDGpP7KvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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