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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3035d3f4f37caaf4d63329c7228849a7bbcfbb2b0154d1ca2a5b0967913c7536' 
  AND token = 'JaIxleFekRIESjxEVobMYwnAIK+my4gR/bwMNXaQ3tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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