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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d80cfab1fc3d25a3a1cae727d2bdb9e0a3004c800570816bff188e23c556aa' 
  AND token = '8fxkH0mm82Ury2qVPPSYHacVMFnXvgOrO6sMMbqRUQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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