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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62be8e0318227ec7a5ffe59d195d3ddddffba24ede492df064b68494504cb49a' 
  AND token = 'eqstt8swYhQ2l0aWa8EuCCY151WYzCZJp/rs+SEhLXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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