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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96930cbe6513bc0555b995d8c6c0d3d5c69ebf79a239c69de9b96a81494a98a3' 
  AND token = 'B8JUfDVNZ7IS3b7/B0P7gCFLvG1DxzYJdSeNqDq5DZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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