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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4fe02485573f327cc27001b1c12e20afb5f730acea10e8d8a7c6016f737a74' 
  AND token = 'BzxkP9O7bdyuPrL3TXsu5z9D9vyvKlOD8gHKDNOuKYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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