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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa104a85f3f1c7e7958dcab0f082bd1e31d3cdb5769e4b391166a584509a8c5' 
  AND token = 'HLQ5p6/yjlBN0E2/0wV015poepuVztHkV3IvFjUvg5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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