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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f5eeea070c8952dff87f35ffc794b3d8b92a5dd08a5b0c31f510cb985a496c' 
  AND token = 'Q15ZZ+8/D3L/Fise8M6BzLGu7WQPrV9xreG5nPraZ1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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