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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ff1e2326c47fb30c69b9cc41918300ba904cfc9bfd0f52577f2716050aada9' 
  AND token = 'eAwFTgb1232euLUBwhKXUuuwGGSL6jV0Y34B4ieheRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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