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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef45d5347daf5c0c4057da96cd4b823fd52edc8606143a0d9215516b8f7602e' 
  AND token = 'H3xbPXeZl0TKoC426Z/inSbdcl34wpvb5xGuLvmq2eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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