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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926edcc86e6d88d8087c592a65796bbb85421078dd32c97f9fcf0c156e0b4efa' 
  AND token = 'LOXu8LUPRulXA7PC3OE92OH3X9YklD0ByjVEOQ3eoSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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