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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960a1e0b482c6f72f9ce392a9e8bc0d680ae8f63468c615806c7ef71f616b2b3' 
  AND token = 'X0EeNvaT5MrSSV6LJIffhQVFXmNkrqXHE3joHUtzLhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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