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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5d0b8650b65ffb30090e7d0aa0572222c0571d4410e7b613dd63732ab6b859' 
  AND token = '3ebW3YE9iMZtrM/WW5S+qlcv1OkQsRdG/zy18QsIMak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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