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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9537b264646913dd787fb308006b6e1180b53bffd720daf2f2eafcddb2e39a6' 
  AND token = 'czzYhuiEWcxD6uyvNoFUMDHozsF/FFU4VJF1Cwk7gTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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