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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a04db5c74fcbe51f78cd6460895c0653dab2840e2b2ff097d8f9daf0be4c7dd' 
  AND token = '9bimcCx68Ds7ho4q9p3zZkaItNXLguCuNx4EULyvDsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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