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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b1613ccd92eb3d985eb405dae035f1a502e384bcf40013372256ec05a79fc2' 
  AND token = '2vk51lcdA0HrOO9cGkQ0BSJ3JkEj94SNB87mmP97qSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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