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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74c8c8fe03604df5743c291903c0087bf02daf3157f0d5ce74650c8e6e0f1e1' 
  AND token = 'vsnQLRvSM+oHqeFtR/KlOgocyuDFkvJqQAawz6ESDds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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