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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7057ff69e7e95f845798829cb7d3a04d015356cb0eb04062b81a70d5aef7eb4' 
  AND token = 'zpShHgRi0Kel4DF8/5fEXAUtXACYqMXQw5fWy7b/Iyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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