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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2db06e67c31bf169d5d82f09d0be9ae51f8cd887586f835ce5704d4d4a828f' 
  AND token = 'Hn3DWgHeYhocOm2kOJp7WlM2TJYTphy5K/gS5Ok646w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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