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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2962e3f3ede8b45cfec638750a0fac3400fcaac26f985ba2068aba58c5e71fb7' 
  AND token = '/ZopnUqk95Yw42b9AuMdWxGY/D8EeONxNCIHLKy7ZWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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