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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c3dc29951c3c2eb2ffe339757479379005d47d4d3cc7aac7593fbb7081ce7d' 
  AND token = 'soQdk4vvPBz/YU6rsrwAlNhuX8MX99SK4nNep12w9RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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