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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ea648cd97dda028dab720e3882530e803bbb3f60abf3deaf4b91cc758f7016' 
  AND token = 'xpihZBvPZzMmiZzAluibm920Tq2R8HAuTTRn4ec38os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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