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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819bfc08298cb015ed9d61a41a47152c2440d8b7ffa6149c9063c53e5010466b' 
  AND token = 'ansJkoAleto4nR3JhmwP1oxuwVPNOqbf1UQIUc/xglk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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