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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fefb95e1f87b1a6521565a34b33bedc9edd0141fdd40085c1a029dade52ed9' 
  AND token = '1Tns5au5bsJ+BIyOIEEqhkbGonG0nMYKczD7qTT26Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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