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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313f0a1e3d54f481823e37a1d8e37a55718fc35d9a1050f47f0c00274dd7ceea' 
  AND token = 'vkqLB/6+gCxUtwMhxko6WbWhEf3sz14fRNdNnPIzuyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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