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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b63d6b9c4f49ca2a52327d3cd7582956e6c8ca51884b17fa0ddffb3c3e6579f' 
  AND token = 'qSMIoEuio2dQGITtFKNqyrfOTZGU1jJxd/RL4vDo6O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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