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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35e55a66c37f97a5ebfaf6430f1a8d220d003f837c30b37dbb48b8e54c7fbae' 
  AND token = 'CpxJ8zRKBixXADie8RimSAPlNtYOsq+AaUMGtU7eGyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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