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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4b812ea62fe321624b759e14894d0234e9f4681220b31fd3537cf949b18b71' 
  AND token = 'D80x5eGDNi2p22rUKRj3dLueN6PmkBrplFgzU9qTEKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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