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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6222fb88ee7654e08006729b9fa741cf10dd5cbe156f8c01a23b07343459969f' 
  AND token = 'eCN54fmce/noik7t7ogCIOa3yzgGICuhP2UhRe3E0oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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